Magnetic ball-milled FeS@biochar as persulfate activator for degradation of tetracycline

In this study, composite of iron sulfide and biochar ([email protected]) was synthesized successfully via physical ball milling applied to the oxidative removal tetracycline (TC) in presence persulfate (PS). Characterization results showed that [email protected], which has a small particle size, can be at preset FeS-BC mass ratio. addition, ball-milled protected] sufficient ferromagnetism. The effects pH, dosages PS, co-existing anions on TC degradation were investigated. Our efficiency enhanced low pH high PS Under optimal conditions (pH = 3.6, [[email protected]] 0.3 g/L [PS] 10 mM), 87.4% could achieved after 30 min. Nevertheless, rate slightly inhibited by inorganic order CO32− > Cl− NO3−. Surface-bound Fe(Ⅱ) S(Ⅱ) acted as electron donors activation process generated SO4− OH surface also participated Fe(III) reduction. BC not only reduced agglomeration FeS, serving continuous source effective Fe, but an shuttle suitable carbon-based adsorption material, facilitating fast transfer among donors, pollutants. Moreover, non-radical processes might exist protected]/PS/TC system. promising activator for remediation other emerging organic contaminants.